Parts of An Atom
artist's representation of an atom. Bohr's Model. Colors may be labelled different.
Symbol of An Atom
(picture on the left) An example of an atom symbol, (picture on the right) The format of an atom symbol (FOR INDONESIA)
Determining the number of Protons, Electrons, and Neutrons
Protons and Electrons
If not electrically charged (will be discussed later), the proton and electron number will be the same as the atom number.
Neutrons
Neutrons can be determined by using this following formula:
Atomic Mass - Atomic Number = Neutron Number
Examples
Proton: 11
Electron: 11
Neutron: 23 - 11 = 12
Proton: 6
Electron: 6
Neutron: 12 - 6 = 6
Ions
Electron count will be added or subtracted by ion charge.If the ion charge is positive (cation / kation), subtract the electron count.
If the ion charge is negative (anion), add the electron count. For example:
Proton: 6
Electron: 6 + 4 = 10
Neutron: 12 - 6 = 6
Proton: 6
Electron: 6 - 2 = 4
Neutron: 24 - 12 = 12